I have 1 photon glow disc I believe that I've never used...doesn't feel as durable as I would like so that's why I'm interested in the Z Glo. Does the photon glow last much longer? How long does the glow on the Z Glo last?

Go to Ebay and get yourself a UV led flash light... they are cheap and 100% better then reg LED! They are called "UV" or "Black light" I got two of them with 21 bulbs in them for around $15 with shipping! nothing better for charging up your disc!